cjmass47

ive been looking all over for an answer to this question and hopefully someone can tell me. my alternator went out last week and my friend has an extra that he got tested and we know works but its from a renix and i have a h.o. does anyone know if it would still work for my jeep. my jeeps a 91 if that does make a difference

Demolition_x

If it has the same connections it will probably work.

I think the early year xjs had a voltage regulator that was external.

00-buck

will not work one has an internal regulator other doesnt

5-90

I probably answer this about once a month, on six or seven different boards. Please do search...

No, it will not work. 1991-up Jeeps got the Nippondenso alternator, with the regulator circuit in the PCM. 1990-earlier Jeeps typically got the Delco alternator (12SI or CS130,) which were internally regulated. They won't cross.

You may be able to set up a Delco as a "one-wire" job and install it in place of the ND, but you'll get a persistent CEL/MIL and it will mask other faults (the PCM will think the regulator isn't working.)

For the XJ:
1984-1996 was the Delco 12SI
1987-1990 was the Delco CS130 (some rare CS121s were used)
1991-2001 was the Nippondenso.

The Delcos are internally regulated, the Nippondenso is not.

Clear? (Sorry, but I get a little frustrated when I have to answer a question again and again and AGAIN! Nothing personal...)

Bustedback

You can replace the brushes in the Nippondenso...if you can find somebody that sells them.